Everybody wants to know how Mad Men ends, but Vincent Kartheiser isn’t giving up any spoilers.

The actor appeared on The Nightly Show with Larry Wilmore, only to discover that its final “Keep It 100” segment was only Mad Men finale-related questions aimed at poor Kartheiser. But he did provide fans with one small detail.

“I do know how it ends, I’ll say this,” Kartheiser said, “I’ll tell you the last three words of the show: Fade to black.”

Ugh. Guess we’ll all have to wait it out for Sunday’s finale, airing at 10 p.m. ET on AMC. AMC’s sister networks (BBC America, IFC, Sundance and WE) will be going black for an hour in honor of the episode, beginning at 10 p.m. ET, with more details available here.